Piano-stool



(No Model.) y Y I H. 'WALTHER- PIANO STOOL.

N0- 4,00.5.28. 'Patented Apr. 2, 1889.

ell/f N, PETERS4 PhnIn-Lihugmpher. Washinguhy D. C

PATENT Finca.

HENRY VALTHER, OF BROOKLYN, NFV YORK.

PIANO-STOOL.

SPECIFICATION forming part of Letters Patent No. 400,528, dated April 2, 1889.

Application filed June Z7, 1888. Serial No. 278,358. (No model.)

The invention consists in the combination,

with a suitable support having a socket, of a iixed tubular screw extending upward from said socket, a rotative and vertically-movable screw en said ixed screw, aplate on said vertically-movable screw, a seat restingupon said l plate, and a rod projecting from the seat into the bore of the fixed screw,'whereby, when the plate on the vertically-movable screw is turned in one direction or the other, the seat is raised or lowered without being turned itself.

The invention alsoconsists in the construction and combination of parts and details, as will be fully described and set forth hereinafter, and pointed out in the claims.

In the accompanying drawings, Figure l is a vertical transverse sectional view of my improved piano-stool. Fig. 2 is an enlarged horizontal sectional view of the elevatingscrew and socket of the same.

Similar letters ot reference indicate spending parts.

The plate A is supported by the legs B, and provided with a central downwardly-extending socket, C, in the bottom of which a tube, D, is lixed and projects upward. Said tube D is provided with an exterior screw-thread that can engage the internal screw-thread of the tube E, projecting downward `from the plate or disk F, upon which the seat G rests. The screw-tube E is guided by a ring, H, secured in the plate A atv the top of the socket,` and by an external collar, H', on said tube-screw E, the rim of said collar being in close proximity to the sides ofthe bore or cavity of the socket C. rlhe tube-screw Dis provided in its inner surface with two or more longitudinal grooves, in which splines can slide that are formed upon a bar, J, projecting from the plate J screwed to the under side oil' the seat G. The plate F is provided with a rim, F', which projects into an annular recess, K, in

Y the rim of the seat G.

L are ornamental knobs on the plate F, and are to be used for turning said plate.

In place of providing the stool with legs B and socket C, the stool can be constructed with a single leg, the upper part of the saine forming the socket.

The operation is as fellows: By turning the plate F in one direction it is raised as the tube-screw E travels upward on the tubular screw D. As the seat K rests upon the plate F, it is also raised with said plate, the bar J moving upward in the fixed tubular screw D. Said bar J cannot turn on its longitudinal axis, and, as it is secured to the seat K, it also prevents the seat being turned on its longitudinal axis. To lower the seat, itis only necessary to turn the plate F in the inverse direction. The tubular screw E then travels downward on the tlxed tubular screw D and the seat descends without turning. rlhe seat can thus be raised orlowered without being` turned. This is a matter of great convenience, as it permits the teacher to adjust. the seat to the proper height for the scholar while the scholar occupies the seat.

Having thus described my invention, I claim as new and desire to secure by Letters Patentx l. ln a piano-stool, the combination, with a support, of a rotative plate or disk, a screw secured to said plate or disk, a screw on the support, on which latter screw the screw secured to the plate works, a seat resting upon said plate, and a rod secured to the seat and preventing the same from turning, substantially as herein shown and described.

2. In a piano-stool, the coinbination,with a socket, of a fixed tubular screw extending upward from the bottom of the saine, a vertical movable and rotative screw screwed on the IOO the Socket and provided with longitudinal grooves in its bore, a rotative vertioally-inovable screw on the fixed screw, a plate on said rotative screw, a seat resting upon said plate, and a bar proj eotin g from said seat through the rotative plate into the bore of the fixed screw, said bar having longitudinal ribs or splines that enter the longitudinal grooves in the bore of the fixed screw, substantially as herein shown and described.

ft. The combination, with a socket, of a iixed tubular screw extending upward from the bottom of the same, a rotative and verticallymovable Screw on the fixed Serew, a plate fixed ou said vertically-movable screw, a seat resting upon said plate, and a rod projecting from the seat through said plate into the bore of the fixed screw and Shaped so as not to turn in said tubular fixed screw, substantially as herein shown and described.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

HENRY XVALTHER.

YVitDeSSeS:

OSCAR F. GUNZ, JOHN A. STRALEY. 

